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Merc 700 sci's

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Old 01-26-2009, 01:39 PM
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Default Merc 700 sci's

Hows everyone doing with their motors out there? How many hours people got so far? any issues? Whats most hours out there now and when are people gonna do any refreshes?

i've got about 50 hours on mine so far (in 2 seasons, pathetic). only issue for mine has been my starboard side pcm limits RPM to 4200-4700 occationaly. Supposedly has something to do with the shift cable. Merc tech has made minor adjustment a few times.
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Old 01-26-2009, 04:42 PM
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Sold a set to a freind, ran hard for 100+ hours, nothing but turn key!!

We might refreshin at 200-250 hours. We will call Merc. when the time comes to find out what they suggest needs to be done!

Great power package!
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Old 01-26-2009, 05:26 PM
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85 hrs no problems.....that I havent created myself.
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Old 01-26-2009, 06:57 PM
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75 hours to date, not one problem..idles 640-700 rpms...turn key.
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Old 01-26-2009, 07:34 PM
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A little off topic but I wonder what the cost would be to refresh the 700 vs. the 850/1075's? I'd imagine it's a bit more cost effective to run these instead of 1075's.
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Old 01-26-2009, 09:18 PM
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77 hours without a hitch!
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Old 01-26-2009, 10:08 PM
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Quote:
Originally Posted by Racerngr1 View Post
A little off topic but I wonder what the cost would be to refresh the 700 vs. the 850/1075's? I'd imagine it's a bit more cost effective to run these instead of 1075's.
I think merc wants them at 125 hours, at a little over 25gs a piece to do it. I would hope the 700 would get more like 250 to 300 hours since there such a mild motor. I ran a custom 600hp 502 for 5 years before doing a total go through and I had a posi lock let go once bent a valve but that was it for 5 years now its a 670hp and has 8 years on it so low hours and still fires up but I am going to change the springs in it if compression test is good just because of age. my new motor a 1050hp would need springs at 200 hours or more.
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Old 01-27-2009, 08:25 AM
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Quote:
Originally Posted by AIR TIME View Post
I think merc wants them at 125 hours, at a little over 25gs a piece to do it. I would hope the 700 would get more like 250 to 300 hours since there such a mild motor. I ran a custom 600hp 502 for 5 years before doing a total go through and I had a posi lock let go once bent a valve but that was it for 5 years now its a 670hp and has 8 years on it so low hours and still fires up but I am going to change the springs in it if compression test is good just because of age. my new motor a 1050hp would need springs at 200 hours or more.
More than one person at Mercury Racing has told me that the lifespan on the 700's has been virtually identical to the 525's in their testing. Since the 700's have not been in the field long enough to see full lifespans in personal boats, we can look at 525's. We do top ends on 525's at 250 hrs and rebuild around 500. Even if they 700's were only to get 400, that is a ton of turn-key boating. Mercury's position is that they are the same life cycle as the 525's though. With a drive that lives at 700hp, they hit a homerun.
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Old 01-27-2009, 08:41 AM
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The 600's and 700's produce little to no boost unitl you really get into the upper RPM range so unless you do a lot of WOT running they should run similar hours to a 525.
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Old 01-27-2009, 10:49 AM
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One of my Customers has over 130 hours and still running strong
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